NFL training camps are in full swing, and so is the heat that early August tends to bring with it.

The Baltimore Ravens had the warmest training camp experience on Tuesday, as the thermometer climbed to 91 degrees n Owing Mills, Md., as the AFC East franchise held practice. In Philadelphia, the defending Super Bowl champion Philadelphia Eagles went through drills as temps hit 86 degrees, but forecasting applications said it felt like almost 100 outside.

Pittsburgh featured the lone reprieve of the day, as head coach Mike Tomlin put his team through preseason work in the afternoon following a rain shower, which cooled things down for the Steelers to 79 degrees.

According to Eagles' quarterback Nick Foles, who led the team through the playoffs and eventually to a title, keeping the fluids flowing is the most important aspect of getting through the warm days before the season kicks off in September.

"Hydration during practice, sipping on water in the heat, you're gonna get loose very quickly out here, so just trying to be smart, not trying to overdo everything," he said. "It really tests you. The heat's different. We're going to play in some hot games, so this is great. This is great to be out here in this humid, hot weather, just stepping in the huddle.

"I know as practices go on, you start sweating a lot, a lot of fluids are drained, sometimes it gets a little harder to focus, harder to think, so that's why these practices are great for us. We're being competitive, we're competing every single play and you watch practice, you see a lot of that, you see a lot of great work."

Added Eagles' quarterback Carson Wentz:

"I try and prep the same. You just sweat a lot more. You sweat a lot more. I like it a little bit more cool, but you just get through it."

Eagles' coach Doug Pederson said he had to adjust drills because of the weather.

"I was going to go pads today, but the weather has been in the 90s. It's been hot and these guys have been working extremely hard," Pederson said.

"We're a little over 48 hours, obviously, to game time. So just wanted to pull back a little bit these last couple days. We had a hard workout in the stadium and just good work these last couple days. Getting them as fresh as I can for Thursday."

The Eagles open preseason play on Thursday against the Steelers at Lincoln Financial Field, while Baltimore will play its second preseason contest against the Rams on the same day.

As for the heat, it's expected to break across the state on Wednesday, leading to cooler temperatures both for the pros and high school athletes and bands who started heat acclimatization this week.